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Pros

Pro

Free and paid versions

There are both versions of Cinch available, though the free version can be naggy.

Pro

Simple and easy to use

So simple, even my grandma can use it

Cons

Con

Does not support the border of multiple displays well

When using multiple displays, the ability to dock a window to half of a display only works on one side of the screen divide. It can work (with some very careful cursor placement) only on the external monitor and not dividing edge of the native (laptop) monitor. It does not support quarter-splits either.

Bottom line, this was a great initial app, adding this capability before anyone else did, but it has been eclipsed by newer apps.